Dear esteem researchers, please I need help on how to simulate wind gust disturbance effect on quad-copter using simulink...?

I want to simulate this wind model 𝜔 ̅(𝑡)= 𝛼_𝑖+𝛽_𝑖 sin⁡(𝑛𝑡) ,using simulink, as external disturbance input into the space model towards building a controller.

Answer 1

[Sam Chak]

Hi @ALABA PHILIP OPAYEMI

I think this is how you connect the Sine Wave block (external disturbance) to the Quadcopter system (State-space block).

with the parameters of entered in the Sine Wave block:

[UASLAB]

Thanks...Please, please permit me to ask one or two questions: 1. how to specify when I want the wind gust to start? 2. how to convert the wind gust output to force?

[Sam Chak]

Hi @ALABA PHILIP OPAYEMI

I can answer Q1, but Q2 sounds like a physics question. Anyhow, look the following comparison.

To specify the time you want to wind gust to occur, you need to use an External Signal to trigger it. And that signal is a Ramp. So, connect a Ramp block to the Sine Wave block.

If you want to trigger the Wind Gust after 5 sec from the beginning of the simulation time, then set Start time: 5 sec.

Results:

Regarding the physics question, I think physicists can answer this better. Since you ask how to convert wind gust into wind force (load), I guess the wind gust is measured in wind speed. I think the formula is given by

where

is force of the wind gust acting on the quadcopter,

is the projected area of the quadcopter surface where the wind molecules are hitting,

is the wind pressure in SI units with is the speed of the wind gust,

is the drag coefficient for the quadcopter that is usually determined experimentally in the Wind Tunnel.

[UASLAB]

@Sam Chak: Thank you